Subject: Re: [PATCH 00/29] Swap over NFS -v15
From: Peter Zijlstra <a.p.zijlstra@chello.nl>
To: Bill Davidsen <davidsen@tmr.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
       Andrew Morton <akpm@linux-foundation.org>, linux-kernel@vger.kernel.org,
       linux-mm@kvack.org, netdev@vger.kernel.org, trond.myklebust@fys.uio.no
In-Reply-To: <476999B7.1000203@tmr.com>
References: <20071214153907.770251000@chello.nl>  <476999B7.1000203@tmr.com>
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Date: Thu, 20 Dec 2007 09:00:04 +0100
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On Wed, 2007-12-19 at 17:22 -0500, Bill Davidsen wrote:
> Peter Zijlstra wrote:
> > Hi,
> >=20
> > Another posting of the full swap over NFS series.=20
> >=20
> > Andrew/Linus, could we start thinking of sticking this in -mm?
> >=20
>=20
> Two questions:
> 1 - what is the memory use impact on the system which don't do swap over=20
> NFS, such as embedded systems, and

It should have little to no impact if not used.

> 2 - what is the advantage of this code over the two existing network=20
> swap approaches,=20

> swapping to NFS mounted file and=20

This is not actually possible with a recent kernel, current swapfile
support requires a blockdevice.

> swap to NBD device?

> I've used the NFS file when a program was running out of memory and that=20
> seemed to work, people in UNYUUG have reported that the nbd swap works,=20
> so what's better here?

swap over NBD works sometimes, its rather easy to deadlock, and its
impossible to recover from a broken connection.

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